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Finding the Fourth Proportional to 253.33, 379.90 and 99.21

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Solution

The fourth proportional to 253.33, 379.90 and 99.21 is: 148.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.33 : 379.90 = 99.21 : x
  2. Step 2: Convert to fraction form
    253.33/379.90 = 99.21/x
  3. Step 3: Cross multiply
    253.33x = 379.90 × 99.21
  4. Step 4: Simplify right side
    253.33x = 37,687.98
  5. Step 5: Solve for x
    x = 37,687.98/253.33
  6. Step 6: Final answer
    x = 148.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.